560.400 Solution?

[ARC5]

Hello from the newbie-est of Nuubs.
I have an instrument that uses the Planar EL560.400 Monochrome Flat panel display.
Besides power, this panel is VGA format, needing Vid data, Vid clock, Horiz. Sync and Vertical sync.
The panel went "blooey" and used replacements (long out of production) cost more than the
instrument is worth.

The panel is VGA with an odd-ball 560x400 resolution that cannot be changed.
I built a patch cord and ran the VGA signal to a common HP PC VGA monitor, using the
GREEN input to take the "Vid Data" and leaving the Red and Blue unterminated.
I get good video and good Horizontal sync, but no Vertical sync. None of the monitors
I've tried can "stretch" enough to lock at the odd resolution.

Is there a device (less expensive than the replacment panel) that can convert
this 560x400 video into something like 640x480, so a common monitor can work?
Or are there old monitors out there that might display this?
Thanks!
David S.

[pandy]

I can imagine display with significantly higher resolution to reduce rescaling errors.

[jagabo]

Old 400 line resolutions were often interlaced (ie, NTSC compatible). Most modern computer monitors won't sync to that. An old Amiga or CGA monitor should.

[Keyser]

Or maybe an old multisync (multiscanning) monitor, if you can find one.

Edit: not to be confused with multifrequency monitors.

[ARC5]

Thanks, all. I will look for those.

[jagabo]

Oops, I forgot: CGA monitors were digital, not analog. So that won't work.

This type of passive VGA to composite adapter might work:

http://sandacite.com/forum/index.php?topic=2431.0

The output will be composite video ready for a TV.

Thinking about this a bit more, are you sure the output of the device is analog VGA? It could be digital CGA. Check the voltages with a oscilloscope. VGA will be analog ranging from 0 to 0.7 volts on the RGB pins, 0 and 5 volts on the sync pins. CGA will be digital, 0 and 5 volts. CGA also has an intensity bit. Also, what are the vertical and horizontal refresh frequencies?